See my post on the first page #10 "rattle". Most likely the track arm. You wont be able to tell by wiggling anything. You can buy them for $200-$300 new or do what I did and smacked them with a socket to tighten the ball joint. About a 30 minute job per side. I have about 4,000 miles on the fix. Can't say how long it will last. About to do the same on the fronts since they are starting to rattle as well.
Just bought a Boxster - 2000 base
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'79 Porsche 928, '00 Porsche Boxster,
'86 Porsche 944, '04 BMW Z4
'77 Fiat Spider 124,'07 Chevy Suburban LTZ
'83 Jeep CJ7, '06 Harley Sportster
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